Despite its “-mycetes” ending the deuteromycetes are not a class; rather this term is now used as a common name for this dumping-ground group of fungi. The deuteromycetes, commonly called molds, are “second-class” fungi that have no known sexual state in their life cycle, and thus reproduce only by producing spores via mitosis, This asexual state is also called the anamorph state. When a fungus lacks the sexual phase (perfect stage) or if this phase has not been observed it is placed within the division Deuteromycota, commonly called as Deuteromycetes or Fungi imperfecti. Because they have no known sexual (teleomorph) state, they cannot be placed with complete confidence in any of the phyla. Commonly known as imperfect fungi because only the asexual or vegetative phases of these fungi are known. Reproduction of Deuteromycota is strictly asexual, occuring mainly by production of asexual conidiospores. The deuteromycetes are commonly called fungi imperfecti, that is, “imperfect fungi.” Those fungi that lack a known sexual reproduction cycle are in the division Deuteromycetes. ----- Please refer to the following plates for characteristic structures in the Moniliales: Deuteromycota (Fungi Imperfecti): Moniliales . A conidium may be defined as an asexual spore that is not produced in a sporangium. Most of them are parasitic and cause various diseases. … As far as we know, these fungi reproduce only by an asexual process. Imperfect fungi have a large impact on everyday human life. The mycelium is septate and branched. Some hyphae may recombine and form heterokaryotic hyphae. The Deuteromycota are characterized by production of septate mycelium and/or yeasts, and a sexual life cycle that is either unknown or absent. Except Deuteromycetes or fungi imperfecti, sexual reproduction is found in all groups of fungi. Some are saprophytes or parasites while a large number of them are decomposers of litter and help in mineral cycling. The deuteromycetes are no longer recognized as a valid taxonomic group. The asexual spores are not found, vegetative reproduction occurs by fragmentation and sexual organs are absent. Perfect or sexual stages are absent. They may reproduce by simple budding or they may produce sterigmata with spores that are shot off forcibly (= ballistospores). (When such an organism’s sexual stage is discovered, the fungus is usually reclassified.) Sexual Reproduction is accomplished by the formation and fusion of gametes. Sexual reproduction is accomplished in three distinct phases such as plasmogamy (protoplasmic fusion), karyogamy (fusion of nuclei), and meiosis (reduction division of zygote). The deuteromycetes reproduce only by asexual spores known as conidia. ⇒ Deuteromycota. Deuteromycetes is a class of fungi that shows only asexual reproduction in their life cycle. Answer. Other variants cause fungal infection of the feet, jock itch and ringworm. There are some 25,000 species of Deuteromycota, or imperfect fungi, so called because their manner of reproduction is asexual and not understood. Also called imperfect fungus. These fungi include numerous molds, one of which is the source of penicillin. Brown spot disease of rice is caused by helminthosporium oryzae, early blight of potato, tomato is caused by Alternaria and Fusarium causes vascular wilts. d)Deuteromycetes (Fungi Imperfecti): In these fungi only asexual method of reproduction by means of conidia has been observed. Most Deuteromycetes reproduce by means of Conidia. (a) Phycomycetes (b) Ascomycetes (c) Basidiomycetes (d) Deuteromycetes. Deuteromycetes. Genetic recombination is known to take place between the different nuclei. Identify the class of fungi. The deuteromycetes have no known sexual (teleomorph) state and usually reproduce asexually (anamorph) by conidia. 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